Machine for gumming or setting saws.



PATENTED DEC. 18, 1906.

W. VAN BUSKIRK.

MACHINE FOR GUMMING 0R SETTING- SAWS.

APPLICATION FILED FEB. 24, 1905.

UNITED STATES PATENT OFFICE.

WILLIAM VAN BUSKIRK, OF ST. JOSEPH, MISSOURI.

MACHINE FOR GUMIVIING OR SETTING SAWS.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed February 24:, 1905. Serial No. 247.1 18,

T aZZ whom, it may concern.-

Be it known that I, WILLIAM VAN BUs- KIRK, of St. Joseph, in the countyof Buchanan and State of Missouri, have invented certain new and usefulImprovements in Machines for Gumming or Setting Saws, of which thefollowing is a specification.

My invention relates particularly to sawgumming machines, and has forits object the production of a die-cutting machine of that class which,besides being simple and economical of manufacture, combines efficiencyand accuracy of operation with facility of operation and variability ofrange of work. In respect to range of work my machine may not only bereadily adapted as a gumming-machine to cut teeth of different depth orshape, but also may be conveniently adapted for setting saws and thelike.

In the accompanying drawings, which constitute a part of thisspecification, and

wherein I show my invention in form of embodiment of a sawgummer, FigureI is a perspective view of my machine in the open position ready toreceive and operate upon a saw. Fig. II is a side elevation of the same,showing the machine in operative relation to a saw in place upon the dieor counter, the extremity of the lever-handle bein broken away. Fig. IIIis a central vertica section, partly broken away, showing thebase-plate, punch, punch-bar, and die or counter in their relativeoperative positions. Fig. IV is a de tail sectional view illustrative ofspecial cutting edges of the die. Fig. V is a detail plan view showingone form of cutting edges of the punch.

Referring to the numerals on the drawings, 1 indicates the base-plate orbase-bar of the machine, which is preferably provided with a foot-piece2, adapted under pressure of the foot of an operator to maintain themachine in position advantageous for operation, particularly in respectto strain applied in practice upon the lever-handle 3, which is pivotedto the member 1 as on the pin 4 between lugs 5, formed as by bifurcationof the member 1. The member 1 is designated the base-plate or base-barof the machine, because it supports directly the impress-receivingmember-to wit, the die or counter 6which sustains the operative strainof the machine and which is for that purpose provided with one or more,and

cutting edges 9 whereof the cutting edges 10 of a properly-gaged andsuitably-actuated rocking punch 11 cooperate shearwise. It is byvariation of the shape of the cutting edges of the punch 11 and itscounter 6 that the work which the machine is adapted to do may bevaried.

By slight variations of the form of the impress-receiving member thefunction of the machine may be varied, as has been suggested, from thatof a gumming or punching machine, as illustrated, to a setting-machine.Moreover, by providing a die 6 with a plurality of clefts 7 and 8, whichis the preferred structure of my machine, as hereinbefore set forth, andby mounting the die movably upon the base-plate l the adaptability ofthe machine may be materially augmented. It may, for example, be in themanner de scribed adapted for gumming saw-teeth of variable contour, asin the IVI-tooth saw illustrated in Fig. II of the drawings. I prefer tomount the member 6 revolubly upon the base-plate 1, as by a screw 15passing through an aperture in the middle of the die 6 and entering athreaded aperture provided for it in the base-plate. By this means themember 6 may be secured movably in place or detached for thesubstitution of another die conveniently and as often as required.

The punch 11 is operatively mounted in a punch-bar 16, that isoperatively connected with the lever-handle 3 and to the base-plate 1.With the object of securing multiplied leverage the punch-bar ispivoted, as indicated at 17, to a link 18, that is pivoted, as indicatedat 19, to the handle 3, while the end of the bar 16 opposite to itspivotal member 17 is pivoted to the base-plate 1 approximately at theend thereof that is opposite to the pivotal connection 4 between thebase-plate and the handle 3. In the construction specified the punch-bar16 is of greater longitudinal extent from its point of pivotalconnection than the base-plate 1, thereby throwing the pivot 17 beyondvertical alinement with the pivot 4 and securing for the operativeleverage upon the bar 16 the great preponderance of the long arm of thelever-handle 3 as compared with its short arm, which is measured by thedistance between the pivotal members 4. and 19.

A convenient structural feature of my machine is shown in the meansemployed for mounting the punch-bar 16 pivotally upon the base-plate 1.It consists in splitting or cleaving the body of the base-plate, whichis made of a considerable weight of metal, as indicated at 20, to formthe foot-piece 2,- previously specified, and the bearing member 21. (Seeparticularly Fig. III.) The bearing member is preferably bifurcated toform jaws 22 and 23, which support the bearing-pin 24, upon which thepunch-bar 16 is mounted, as heretofore suggested.

The bearing member 21 and the punch-bar 16 adjacent to its pivotalconnection therewith are oppositely curved, as illustrated, in order toprovide suitable space for the play ,of the punch 11 for the performanceof its shearwise-cutting function and for imparting to it the desireddirection of movement. The operative movement of the punch 11, whichtheshapes of its operative actuating members last referred to are designedto accommodate, is characterized by a rocking movement in large measuredetermined by the shape of the punch itself, which being, in effect, alever as well as a shearing member constitutes an important factor inthe eflicient operation of the machine. Using the term punch in thebroad sense of an impress-presenting member as correlated to theimpress-receiving member 6 previously specified, I define it in itspreferred form of embodiment to be a lever or bar having a rounded heel25, which during its movement of actual operation rides upon the face ofthe base-plate 1 and having a toe-piece 26, which under impulse of thebar 16 cooperates with the heel 25 to actuate it. Nearer the heel 25than the toe-piece 26 the punch is provided with a supporting-lug 27,which entering a recess 28 in the under side of the punch-bar 16 (seeFig. III) is secured loosely therein, as by a loose transverse -pin 30.The pin 30 may be loosely inserted, because, as will presently be madeto appear, it has to sustain but little stress in operation, and it isloosely inserted in order to facilitate the substitution of one punchfor another as often as wear or the change or readjustment of the die 6may require.

In 0 eration the lever 3 is lifted toward a position at right angleswith the base-plate 1, as shown in Fig. I, in which position thepunch-bar 16, by reason of its curvature and the curvature of itsbearing member 21, is lifted sufficiently not only to permit thetoepiece 26 by gravity to drop toward the die 6, but also to raise theheel 25 of the upper face of the die sufiiciently to admit of theintroduction of the object to be operated upon. (Illustrated in Fig. IIas a sawblade 31.) If from the position shown in Fig. I the handle 3 bepressed toward its position shown in Fig. II, which is the same as thatwhich it would occupy in Fig. III if Fig. III afforded completeillustration of the machine, the heel 25 is first presented against theface of the baseplate 1, which thereupon becomes the main bearing-pointfor its continued rotative movement. Its working movement is derivedfrom depression of the lever-handle 3 through engagement of thetoe-piece 26 with the under side of the punch-bar 16, and the punchbecoming, in effect, an integral part of the punch-bar and workingsolidly with true shearwise action against the cutting edges of its dieit performs the function required of the machine with perfect efficiencyand accuracy.

for it within the lug 27, does not receive the strain of pressure inoperation, but that the strain is distributed among the heel 25, toepiece 26, lug 27, and the points of contact between those severalmembers and the baseplate and punch-bar, respectively.

The material of which my machine is constructed may be of iron or steel,with the eX- ception of the impress presenting and receiving members,which are preferably of suitably-hardened steel, it being quite obviousthat the impress presenting and receiving members, respectively, may bevaried from their function of cutting members to swaging or bending orsetting members.

The cutting edges 9 of the clefts of the die or counter 6 are of specialconstruction, being everted or uplifted above the surface of the die, asclearly illustrated in Fig. IV of the drawings. This feature ofconstruction is important, because it prevents bending of the saw-bladeunder the gumming operation, the everted edges serving to support theblade exclusively and effecting a true and even shearwise out againstit.

Further specification of details appears to be unnecessary, it being mypurpose to have it distinctly understood that I do not intend to confinemyself to details of. construction, but to reserve the right to modifyand vary the same at will within the scope of my invention as defined bythe appended claims in view of the art to which. the inventionappertains.

What I claim is 1. In a machine of the kind described, the combinationwith a base-plate, punchbar, and means for actuating the same, of apunch including a toe-piece loosely mounted on the punch-bar, and a heelupon the punch adapted in operation to ride upon the base-plate, theheel-piece and the toe-piece being at opposite ends of the punch.

2. In a machine of the kind described, the combination with abase-plate, punchbar, and means for actuating the same, of a punchloosely mounted on the punch-bar, a heel upon the punch. adapted inoperation to ride upon the base-plate, and a toe-piece on the punch.adapted to operatively engage the punch-bar.

3. In a machine of the kind described, the combination with abase-plate, punch-bar, and means for actuating the same, of a die It maybe observed that the pin 30, fitting loosely within the apertureprovided upon the base-plate, a lever loosely pivoted 1 oted to theother end thereof, a link connecto the punch-bar nearer one end thereof,said tion between the free end of said punch-bar lever being provided,in operation, with bearings against the punch-bar and the baseplate,respectively. I

4. In a machine of the kind described, the combination with abase-plate, punch-bar, and means for actuating the same, of a die uponthe base-plate, and a punch loosely secured to the punch-bar by a pin,said punch being provided in operation with a bearing against thebase-plate, and with a bearing against the punch-bar independent of said5. In a machine of the kind described, the combination with abase-plate, of a punch bar pivoted to one end thereof, a lever pivandsaid lever, a die movably mounted on said base-plate and a punch looselypivoted to said punch-bar and provided with a heel adapted in operationto rest on said baseplate near the pivot-pin of said punch-bar, and atoe adapted in operation to engage the under side of said punch-barwhereby a very powerful shearing cut is obtained.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

WILLIAM VAN BUSKIRK.

WVitnes'ses:

THEO RIESENMEY, JOHN M. STAUBER.

